الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::660622e168b210370f0cce98ffe0252cTesthttps://doi.org/10.17583/mcs.7375Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::59a174f6456e73685918efdddbbf16d0Testhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0719-56052020000200437Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::266fb0c5dfbd069ae2e39b686aabdff2Testhttp://www.sophiaaustral.cl/index.php/shopiaaustral/article/view/238Test